/* FILE-MAP:
purpose: >
  Design system of ORRERY — the technical monograph. Light-mode Swiss/International
  observatory archive: paper/ink palette with marine navy promoted to system accent,
  Archivo width axis for display, Fragment Mono for data, 12-col grid broken by
  figure plates, visible baseline drafting texture, self-drawing SVG diagrams,
  CSS orbit systems with correct relative periods.
plain: >
  A folha de estilos principal do site Orrério: cores de papel e tinta, grade
  de desenho técnico, tipografia e as animações das figuras.
depends_on:
  - path: ../assets/fonts/archivo/font.css
    uses: [Archivo variable, wdth 62.5..125]
  - path: ../assets/fonts/fragment-mono/font.css
    uses: [Fragment Mono 400 normal+italic]
used_by:
  - path: ../index.html
  - path: ../guide/index.html
touches:
  db_tables: []
  env: []
  config_files: []
  cache_keys: []
effects: []
invariants:
  - contrast >= 4.5:1 body text (ink/paper 15.74, navy/paper 12.64, ink-2/paper 7.15)
  - no #000/#FFF absolutes; vermilion <= 1 element per viewport
  - prefers-reduced-motion honored (all animation off, strokes pre-drawn)
  - mobile-first single column; grid engages at 880px
category: frontend
kind: stylesheet
END-FILE-MAP */

/* ---------- tokens ---------- */
:root {
  --paper: #F4F1EA;
  --section: #ECE8DE;
  --ink: #16181D;
  --ink-2: #4C505A;
  --navy: #1F2A44;
  --vermilion: #C8371F;
  --line: rgba(22, 24, 29, 0.22);
  --line-soft: rgba(22, 24, 29, 0.09);
  --line-faint: rgba(22, 24, 29, 0.045);
  --paper-on-navy: #F4F1EA;
  --shadow-navy: 0 18px 40px -18px rgba(31, 42, 68, 0.28);

  --font-display: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'Fragment Mono', 'Courier New', monospace;

  --baseline: 2rem;            /* 32px — visible drafting baseline */
  --gutter: 1.5rem;
  --measure: 62ch;

  --draw-ease: cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* ---------- reset-lite ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.0625rem;
  line-height: var(--baseline);
  font-stretch: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, p, figure, table { margin: 0; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; }

/* visible baseline grid — the drafting texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    var(--line-faint) 0 1px,
    transparent 1px var(--baseline)
  );
  z-index: 0;
}
body > * { position: relative; z-index: 1; }

/* ---------- a11y ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--navy);
  color: var(--paper-on-navy);
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }
:focus-visible { outline: 2px solid var(--navy); outline-offset: 2px; }

/* ---------- primitives ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.mono-num { font-family: var(--font-mono); }
.wrap {
  max-width: 84rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3.5rem);
}
.rule { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* ---------- masthead ---------- */
.masthead {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.masthead .wrap {
  display: flex;
  align-items: center;
  gap: 1rem 2rem;
  flex-wrap: wrap;
  padding-block: 0.875rem;
}
.masthead-logo { color: var(--navy); display: inline-flex; }
.masthead-logo svg { height: 1.625rem; width: auto; }
.masthead-meta {
  color: var(--ink-2);
  font-size: 0.6875rem;
}
.masthead-clock { color: var(--ink-2); font-size: 0.6875rem; margin-left: auto; }
.masthead-nav { display: flex; gap: 1.25rem; }
.masthead-nav a {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.masthead-nav a:hover { border-bottom-color: var(--navy); color: var(--navy); }
.masthead-nav a[aria-current="page"] { border-bottom-color: var(--navy); color: var(--navy); }

/* ---------- 12-col grid (>=880px) ---------- */
.grid {
  display: block;
}
@media (min-width: 880px) {
  .grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: var(--gutter);
  }
}

/* ---------- cover ---------- */
.cover { padding-block: calc(var(--baseline) * 2) calc(var(--baseline) * 1.5); }
.cover-kicker {
  color: var(--ink-2);
  margin-bottom: var(--baseline);
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.cover-kicker .k-sep { color: var(--line); }
.cover-title {
  font-stretch: 125%;
  font-weight: 760;
  font-size: clamp(2.625rem, 8.2vw, 7rem);
  line-height: 0.95;
  letter-spacing: -0.015em;
  text-transform: uppercase;
  max-width: 12ch;
}
.cover-title .t-navy { color: var(--navy); }
.cover-abstract { margin-top: var(--baseline); }
.cover-abstract .abstract-label {
  color: var(--vermilion);
  margin-bottom: 0.5rem;
}
.cover-abstract p {
  max-width: var(--measure);
  color: var(--ink);
}
.cover-abstract p + p { margin-top: 1rem; color: var(--ink-2); }
@media (min-width: 880px) {
  .cover-title { grid-column: 1 / 11; }
  .cover-abstract { grid-column: 7 / 13; margin-top: calc(var(--baseline) * 1.5); }
}

/* constants strip */
.constants {
  border-block: 1px solid var(--line);
  margin-top: calc(var(--baseline) * 1.5);
}
.constants ul {
  list-style: none;
  margin: 0;
  padding: 0.75rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0;
}
.constants li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--ink-2);
  padding-right: 1.25rem;
  margin-right: 1.25rem;
  border-right: 1px solid var(--line-soft);
}
.constants li:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.constants b { color: var(--ink); font-weight: 400; }

/* ---------- figure plates ---------- */
.plate {
  background: var(--section);
  border: 1px solid var(--line);
  padding: clamp(0.75rem, 2vw, 1.5rem);
  position: relative;
}
.plate svg { width: 100%; height: auto; }
.plate figcaption {
  margin-top: 0.75rem;
  padding-top: 0.625rem;
  border-top: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.plate figcaption .fig-id { color: var(--ink); }

/* cover plate breaks the grid into the margins */
.plate--breakout { margin-top: calc(var(--baseline) * 1.5); }
@media (min-width: 1100px) {
  .plate--breakout { margin-inline: calc(-1 * clamp(0rem, 2.5vw, 2.5rem)); }
}

/* ---------- chapters (zig-zag) ---------- */
.chapter { padding-block: calc(var(--baseline) * 2); border-top: 1px solid var(--line); }
.chapter-head { margin-bottom: var(--baseline); display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 1.25rem; }
.chapter-no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.07em;
  color: var(--ink-2);
  white-space: nowrap;
}
.chapter-title {
  font-stretch: 125%;
  font-weight: 740;
  font-size: clamp(1.75rem, 3.6vw, 2.875rem);
  line-height: 1.02;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}
.chapter-lead {
  font-weight: 560;
  font-size: 1.1875rem;
  max-width: 30ch;
  margin-bottom: 1rem;
}
.chapter-copy p { max-width: var(--measure); color: var(--ink-2); }
.chapter-copy p + p { margin-top: 1rem; }
.chapter-copy strong { color: var(--ink); font-weight: 560; }

@media (min-width: 880px) {
  .chapter-text { grid-column: 1 / 5; }
  .chapter-fig { grid-column: 5 / 13; }
  .chapter--flip .chapter-text { grid-column: 9 / 13; grid-row: 1; }
  .chapter--flip .chapter-fig { grid-column: 1 / 9; grid-row: 1; }
  .chapter-fig { align-self: start; }
}
.chapter-fig { margin-top: var(--baseline); }
@media (min-width: 880px) { .chapter-fig { margin-top: 0; } }

/* marginalia — vertical fig annotations in the outer margin */
.marginalia {
  display: none;
}
@media (min-width: 1240px) {
  .marginalia {
    display: block;
    position: absolute;
    top: 0;
    right: calc(-1.25rem - 1ch);
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-2);
    white-space: nowrap;
  }
  .chapter--flip .marginalia { right: auto; left: calc(-1.25rem - 1ch); transform: rotate(180deg); }
}

/* ---------- formula + data tables ---------- */
.formula {
  font-family: var(--font-mono);
  font-size: clamp(1.125rem, 2.4vw, 1.5rem);
  letter-spacing: 0.02em;
  color: var(--navy);
  border-left: 2px solid var(--navy);
  padding: 0.375rem 0 0.375rem 1rem;
  margin: 1.25rem 0;
}
.formula small { display: block; font-size: 0.6875rem; color: var(--ink-2); letter-spacing: 0.06em; margin-top: 0.25rem; }

.data-table { width: 100%; border-collapse: collapse; margin-top: 1.25rem; }
.data-table caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding-bottom: 0.5rem;
}
.data-table th, .data-table td {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  text-align: left;
  padding: 0.4375rem 1rem 0.4375rem 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-2);
  font-weight: 400;
  white-space: nowrap;
}
.data-table thead th {
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  text-transform: uppercase;
  font-size: 0.6875rem;
}
.data-table td:last-child, .data-table th:last-child { text-align: right; padding-right: 0; }
.data-table .t-em { color: var(--ink); }
.data-table .t-verm { color: var(--vermilion); }

.footnote {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.03em;
  color: var(--ink-2);
  margin-top: 0.75rem;
}

/* ---------- SVG stroke/fill system ---------- */
.s-ink { stroke: var(--ink); fill: none; }
.s-soft { stroke: var(--line); fill: none; }
.s-faint { stroke: var(--line-soft); fill: none; }
.s-navy { stroke: var(--navy); fill: none; }
.s-verm { stroke: var(--vermilion); fill: none; }
.f-ink { fill: var(--ink); }
.f-navy { fill: var(--navy); }
.f-verm { fill: var(--vermilion); }
.f-navy-10 { fill: rgba(31, 42, 68, 0.10); }
svg .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  fill: var(--ink-2);
}
svg .label--em { fill: var(--ink); }
svg .label--verm { fill: var(--vermilion); }

/* self-drawing strokes: every path/circle carries pathLength="1" */
[data-draw] .draw {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}
[data-draw].is-drawn .draw {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1.3s var(--draw-ease);
  transition-delay: calc(var(--i, 0) * 110ms);
}
[data-draw] .pop { opacity: 0; }
[data-draw].is-drawn .pop {
  opacity: 1;
  transition: opacity 0.6s ease;
  transition-delay: calc(0.9s + var(--i, 0) * 110ms);
}

/* orbit system — correct relative periods, T² ∝ a³ */
@keyframes orbit-rot { to { transform: rotate(360deg); } }
.orbit {
  animation: orbit-rot var(--T, 20s) linear infinite;
  animation-play-state: paused;
  transform-box: view-box;
  transform-origin: var(--cx) var(--cy);
}
.fig-live .orbit { animation-play-state: running; }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(12px); }
.reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s ease, transform 0.7s var(--draw-ease);
  transition-delay: calc(var(--i, 0) * 90ms);
}

/* ---------- finale (navy plate) ---------- */
.finale {
  background: var(--navy);
  color: var(--paper-on-navy);
  padding-block: calc(var(--baseline) * 2.5);
  box-shadow: var(--shadow-navy);
  position: relative;
  overflow: hidden;
}
.finale::after {
  content: '';
  position: absolute;
  right: -6rem;
  top: 50%;
  transform: translateY(-50%);
  width: 30rem;
  height: 30rem;
  background: url('../assets/logos/ezon-emblem.svg') no-repeat center / contain;
  opacity: 0.07;
  pointer-events: none;
}
.finale-kicker { color: rgba(244, 241, 234, 0.62); margin-bottom: var(--baseline); }
.finale-title {
  font-stretch: 125%;
  font-weight: 740;
  font-size: clamp(1.875rem, 4.6vw, 3.75rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  max-width: 22ch;
}
.finale-sub {
  margin-top: var(--baseline);
  color: rgba(244, 241, 234, 0.78);
  max-width: 52ch;
}
.finale .wrap { position: relative; z-index: 1; }

/* ---------- footer index ---------- */
.footer-index { border-top: 1px solid var(--line); padding-block: calc(var(--baseline) * 1.5); }
.footer-index h2 {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 0.875rem;
}
.footer-col { margin-bottom: var(--baseline); }
@media (min-width: 880px) {
  .footer-col { margin-bottom: 0; }
  .footer-col:nth-child(1) { grid-column: 1 / 4; }
  .footer-col:nth-child(2) { grid-column: 4 / 7; }
  .footer-col:nth-child(3) { grid-column: 7 / 10; }
  .footer-col:nth-child(4) { grid-column: 10 / 13; }
}
.footer-index ul { list-style: none; margin: 0; padding: 0; }
.footer-index li {
  font-family: var(--font-mono);
  font-size: 0.71875rem;
  letter-spacing: 0.03em;
  color: var(--ink-2);
  padding: 0.34375rem 0;
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}
.footer-index li span:last-child { color: var(--ink); text-align: right; }
.footer-index a { text-decoration: none; color: inherit; }
.footer-index a:hover { color: var(--navy); text-decoration: underline; }
.colophon {
  border-top: 1px solid var(--line);
  margin-top: var(--baseline);
  padding-top: 0.875rem;
  display: flex;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.65625rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.colophon .c-logo { color: var(--navy); }
.colophon .c-logo svg { height: 0.875rem; width: auto; }

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .orbit, .fig-live .orbit { animation: none; }
  [data-draw] .draw { stroke-dasharray: none; stroke-dashoffset: 0; transition: none; }
  [data-draw] .pop { opacity: 1; transition: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}